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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff859d2670bbbb1927b14ee85a3e00a40a754aa17b4f4d627f99382dc7ba3b3' 
  AND token = 'MW/lu9+TtEYwy7KDdHvwdGmYcuXDf1giQ4Ov9c1xlNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}